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Table 1 Characteristics of included studies

From: Risk factors for adjacent segment degeneration after posterior lumbar fusion surgery in treatment for degenerative lumbar disorders: a meta-analysis

First author

Year

Country

No. of participants

Follow up time (years)

Study type

ASD

Total

Guoquan Zheng [12]

2020

China

17

200

7

Retrospective

HUANG LIN [13]

2017

China

40

221

2-4

Retrospective

HUANG MI [14]

2014

China

18

109

2

Retrospective

Hui Wang [15]

2017

China

15

237

4-6

Retrospective

Jinqian Liang [16]

2014

China

28

84

5

Retrospective

Takahiro Makino [17]

2018

Japan

5

41

2

Retrospective

Yeon Heo [18]

2015

Korea

33

378

6

Retrospective

Zhao-Ming Zhong [19]

2017

China

18

154

5

Retrospective

Zhaoxin Ma [20]

2019

China

22

71

3-6

Retrospective

 Shuta Ushio [21]

2019

Japan

22

50

2-9

Retrospective

Seyed Reza Bagheri [22]

2019

Iran

76

630

7-11

Retrospective

Jun Seok Bae [23]

2010

Korea

11

103

6-9

Retrospective

Kyoung-Suok Cho [24]

2009

Korea

9

81

8

Retrospective

 Jaewan Soh [25]

2013

Korea

21

55

5

Retrospective

 Jigar Anandjiwala [26]

2011

Korea

14

68

5

Retrospective

 Masayuki Miyagi [27]

2013

Japan

14

23

4

Retrospective

Bai-Ling Chen [28]

2011

China

11

49

2-4

Retrospective

LI WEISHI [29]

2018

China

50

72

6

Retrospective

GUO YANG [30]

2020

China

116

270

3-5

Retrospective